分析了电子的准中性假设、玻耳兹曼分布假设、粒子模型在电推力器流动模拟中的适用性和优劣性,提出了一种新的电子处理方法——电子漂移扩散近似,采用该方法模拟了离子发动机栅极光学系统等离子体运动过程.结果表明:该方法得出的电势分布、离子相空间分布及电子数密度分布与经典的电子玻耳兹曼分布假设处理方法计算结果一致,验证了该方法可以很好地应用于电推力器栅极光学系统模拟.%The applicability, advantages and disadvantages of quasi-neutral assumption, Boltzmann distribution assumption, and particle model of electrons in the electric thruster flow simulation are analyzed. Based on the analysis, a new method:electron drift-diffusion approximation is presented, which is used to simulate the plasma movement in optical system of ion thruster, and its feasibility is verified in optical system simulation. Simulation results show the plasma potential distribution, ion phase space distribution and the electron density distribution is consistent with the results of the Boltzmann distribution assumption, and the feasibility of this new method is verified.
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